我想发送iCalendar会议邀请。我正在使用Google App引擎Java。 我设法发送带有iCalendar文件作为附件的邮件，但Outlook等程序不会自动将其识别为会议邀请。
我想，我必须将附件的内容类型设置为：“text / calendar; method = REQUEST”，但在我看来，GAE不接受这个？
更新：上面我错了。我实际上发现，我必须在内容中直接发送带有iCalendar部分 的邮件，而不是附件！所以我的问题是，GAE似乎不接受设置消息本身的内容类型。
是否有人使用GAE通过邮件成功发送会议邀请iCalendar元素？
更新
我明白，我必须更加具体。实际上，我想发送iMip消息。 iMip消息不是多部分，其内容类型是“文本/日历”。在发送会议邀请的情况下，它将是“text / calendar; method = REQUEST”。所以我试过这个：
Message msg = new MimeMessage(session);
msg.setContent(iCalendarAsString, "text/calendar;method=REQUEST");
然后我用Transport.send（..）;
发送消息在GAE的开发服务器的日志中我看到内容类型是“text / plain”。 这就是为什么我说，我认为，GAE不接受设置不同的内容类型。
或者我错了？
更新2
好的，这是完整的代码：
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
try {
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("ical@someapp.appspotmail.com", "SomeApp"));
msg.addRecipient(Message.RecipientType.TO,
new InternetAddress("me@mydomain.de", "Sven Busse"));
msg.setSubject("meeting invitation!");
msg.setContent(iCalendarAsString, "text/calendar;method=REQUEST");
Transport.send(msg);
} catch (AddressException e) {
log.warning(e.toString());
e.printStackTrace();
} catch (MessagingException e) {
log.warning(e.toString());
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
log.warning(e.toString());
e.printStackTrace();
}
因此，我将内容类型设置为“text / calendar; method = REQUEST”。一旦发送，这就是日志：
14.09.2011 09:52:59 com.google.appengine.api.mail.dev.LocalMailService log
INFO: MailService.send
INFO: From: SomeApp <ical@someapp.appspotmail.com>
INFO: To: Sven Busse <me@mydomain.de>
INFO: Reply-to: SomeApp <ical@someapp.appspotmail.com>
INFO: Subject: meeting invitation!
INFO: Body:
INFO: Content-type: text/plain
INFO: Data length: 458
因此，日志看起来不太漂亮，但您可以看到，内容类型已更改为“text / plain”。
更新3：
Delivered-To: me@mydomain.de
Received: by 10.68.59.7 with SMTP id v7cs112540pbq;
Thu, 15 Sep 2011 07:45:55 -0700 (PDT)
Received: by 10.52.95.44 with SMTP id dh12mr1121151vdb.20.1316097954738;
Thu, 15 Sep 2011 07:45:54 -0700 (PDT)
Return-Path: <3oQ9yTgoJCgIdqqmngvqpciockn.eqouxgp.dwuugiqqingockn.eqo@2uix4h7xygsz66weerlq.apphosting.bounces.google.com>
Received: from mail-vw0-f69.google.com (mail-vw0-f69.google.com [209.85.212.69])
by mx.google.com with ESMTPS id o9si1579035vcv.136.2011.09.15.07.45.53
(version=TLSv1/SSLv3 cipher=OTHER);
Thu, 15 Sep 2011 07:45:53 -0700 (PDT)
Received-SPF: pass (google.com: domain of 3oQ9yTgoJCgIdqqmngvqpciockn.eqouxgp.dwuugiqqingockn.eqo@2uix4h7xygsz66weerlq.apphosting.bounces.google.com designates 209.85.212.69 as permitted sender) client-ip=209.85.212.69;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3oQ9yTgoJCgIdqqmngvqpciockn.eqouxgp.dwuugiqqingockn.eqo@2uix4h7xygsz66weerlq.apphosting.bounces.google.com designates 209.85.212.69 as permitted sender) smtp.mail=3oQ9yTgoJCgIdqqmngvqpciockn.eqouxgp.dwuugiqqingockn.eqo@2uix4h7xygsz66weerlq.apphosting.bounces.google.com
Received: by vws20 with SMTP id 20so3831617vws.4
for <me@mydomain.de>; Thu, 15 Sep 2011 07:45:53 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.236.187.1 with SMTP id x1mr5481998yhm.8.1316097953249; Thu, 15
Sep 2011 07:45:53 -0700 (PDT)
Reply-To: SomeApp <ical@someapp.appspotmail.com>
X-Google-Appengine-App-Id: someapp
Message-ID: <20cf305e2551fe38a104acfbee28@google.com>
Date: Thu, 15 Sep 2011 14:45:53 +0000
Subject: meeting invitation!
From: SomeApp <ical@someapp.appspotmail.com>
To: Sven Busse <me@mydomain.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed; delsp=yes
BEGIN:VCALENDAR
PRODID:-//Ben Fortuna//iCal4j 1.0//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VEVENT
DTSTAMP:20110915T144552Z
UID:20110915T144552Z-1@someapp.appspotmail.com
SUMMARY:tolles projekt\, macht viel spass.
DTSTART;VALUE=DATE:20110919
DTEND;VALUE=DATE:20110926
DESCRIPTION:tolles projekt\, macht viel spass.
ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:mailto:me@mydomain.de
ORGANIZER:mailto:ical@someapp.appspotmail.com
END:VEVENT
END:VCALENDAR